Tri Sli but not enough gold fingers What next?

I have one gtx 570 amp 1g zotac card, two gtx 570 1g zotac cards non-amp editions.

The amp edition has two pcb gold finger tabs for sli, the non amp editions have one gold finger tab for sli.

I have no bridge that hits all three on a single row. All the bridges appear to have the two row config. I can put the amp in the middle and run one bridge up and one bridge down, but I have no bridge connection point for the 1 and 3 cards to connet. I have a crosshair v and it runs fine. I need tri sli but have not enough tabs. What is my best path.